Thanks for the reply, but several of my roots are deeper than 18", that have gone to the house. The material I used was PVC car-port or porch roof type panels, overlapped 12", in the direction away from the base of each tree (I riveted them together). Some small feeder roots have found their way around/through the overlapped joints. So other than digging this out and installing more or a different type, which is a lot of work, I was wondering if there was a "root inhibitor", some type of mixture or solution, when applied to the soil, or under the surface of the soil, which would discourage the roots from going that direction. Would the salt work, if there are no active roots in the area yet, or is there too much risk of harm to the tree?
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